CVE-2012-0216 in apache2
Summary
by MITRE
The default configuration of the apache2 package in Debian GNU/Linux squeeze before 2.2.16-6+squeeze7, wheezy before 2.2.22-4, and sid before 2.2.22-4, when mod_php or mod_rivet is used, provides example scripts under the doc/ URI, which might allow local users to conduct cross-site scripting (XSS) attacks, gain privileges, or obtain sensitive information via vectors involving localhost HTTP requests to the Apache HTTP Server.
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Analysis
by VulDB Data Team • 04/30/2025
The vulnerability identified as CVE-2012-0216 represents a significant security flaw in the default Apache HTTP Server configuration on Debian systems, specifically affecting versions prior to the mentioned patches. This issue stems from the inclusion of example scripts within the default documentation directory structure under the doc/ URI path, which creates an unintended attack surface when mod_php or mod_rivet modules are enabled. The vulnerability is particularly concerning because it leverages the default server configuration to provide accessible entry points for malicious actors who can exploit these examples to execute unauthorized actions against the system.
The technical implementation of this vulnerability involves the exposure of example scripts that are typically intended for educational purposes but are made publicly accessible in production environments. When Apache is configured with mod_php or mod_rivet modules, these example scripts can be executed directly through HTTP requests to localhost, creating a pathway for attackers to manipulate the server behavior. The flaw allows local users to potentially execute cross-site scripting attacks by leveraging the accessible documentation paths, which can lead to privilege escalation or information disclosure. This occurs because the default configuration fails to properly restrict access to these example files, making them available to any user who can make HTTP requests to the server.
The operational impact of CVE-2012-0216 extends beyond simple information disclosure, as it provides attackers with potential privilege escalation capabilities through the execution of malicious payloads within the context of the web server process. When mod_php is enabled, the example scripts can be interpreted and executed as PHP code, allowing attackers to potentially execute arbitrary commands or access sensitive server information. The vulnerability is particularly dangerous because it exploits the trust relationship between localhost requests and the web server, which typically have more permissive access controls than external requests. This configuration issue creates a scenario where local users can leverage the web server's privileges to gain unauthorized access to system resources, potentially leading to complete system compromise.
This vulnerability aligns with CWE-200, which covers "Information Exposure," and CWE-79, which addresses "Cross-Site Scripting," while also mapping to ATT&CK techniques involving privilege escalation and information gathering. The attack surface is particularly wide because it affects multiple Debian releases and is triggered by the default installation configuration rather than requiring specific malicious setup. Organizations deploying Apache servers on Debian systems must understand that the default configuration includes potentially dangerous examples that can be exploited by local users who have access to the localhost interface. The vulnerability demonstrates how seemingly innocuous documentation examples can become security risks when combined with specific module configurations, highlighting the importance of proper security hardening and the principle of least privilege in server configurations.
Mitigation strategies for CVE-2012-0216 require immediate patching of affected Apache packages to the versions that include security fixes, specifically targeting the Debian squeeze 2.2.16-6+squeeze7, wheezy 2.2.22-4, and sid 2.2.22-4 releases. System administrators should also implement additional configuration hardening measures, including disabling or removing example scripts from the default installation paths, restricting access to the doc/ URI through proper Apache configuration directives, and ensuring that mod_php and mod_rivet modules are only enabled when absolutely necessary. The recommended approach involves implementing access controls that prevent unauthorized users from accessing documentation directories, particularly those containing executable scripts. Organizations should also conduct regular security audits to identify and remove any unnecessary example files or modules that could create similar vulnerabilities in other components of their web infrastructure, following the security principle that default configurations should not provide attack vectors for malicious actors.